Dustry



Patented Sept. 8, 1925.

UNITED STATES 1,552,737. PATENT, OFFICE.

. GAS-TON ALBERT DURET, o PAE s, FRANCE.

PROCESS FOR UTILIZING THE WATER E oM PULP PRESSES AND THE RESIDUAL wATEE PRODUCED BY THE EXTRACTION OF THE JUICES IN TH E BEETROOT-SUGAR IN- DUSTBY.

No Drawing.

This invention has for its object the con centration of the water fromrpulp presses and residual water produced by the extraction of the juices in the beetroot sugar industry, for the'purpose of utilizing all the food or fertilizing matters theycontain.

The average analysis of the water from pulp presses per litre is the following:

Sugar, l gr. 6 to 5 gr.; total nitrogen,

0 gr. 21 to 0 gr. 26; ashes, 0 gr. 90 to 1 gr.

organic matters, 6 gr. to 8 gr.; matters in suspension, 5 gr. to 22 gr.

Up to this day these waters were disposed of either by distributing them in the ground or by filtration or by bacterian sowings so.

as to destroy any fermentation, in order to allow this water to return to the rivers.

. None of these processes has given entire satisfaction and their application was in most cases very costly.

This invention consistszin concentrating.

these waters by subjecting them to an evaporation in multiple-eifect apparatus, working under pressure so as to be able to replace the quantity of high pressure steam entering in the apparatus, by an equal quantity of steam but of lower pressure, which can I be used in the works instead of the initial steam; in mixing the syrup or liquor obtained with chopped straw, oil-cakes or any other ligneous or woody substances, to produce a food of great value for cattle; the syrup may also, owing to the fertilizing elements it contains, be used for the manufacture of manure.

F or the application of this process, various cases may occur:

1st case-Case of a central sugar mill where all the beetroot juixcs are evaporated and converted into suga.

2nd case.-Case of a rasping mill where the extraction of the juice is simply effected and subsequently sent to the central mill.

1st case-Central mill: Theinitial steam considered comes from generators and its Application 'filed March 31, 1921. Serial No. 457,566.

pressure may reach ten to twelve kilograms.

In the usual conditions of working, this steam would be sent in the evaporating 'apparatus for the sweet juice of the mill under a maximum pressure of 1 kg. 500 to 2 kg.

' There istherefore an unnecessary expansion and2kg." j

' In the process forming the subject matter ofthis invention, this steam is sent in the evaporating apparatus for water from pulp presses, constituted by 2, 3 or 4 effects.

The direct steam will first enter the evaporating apparatus for water from pulp presses at 6 kg. for instance and the last of this steam" without workbetween 12kg.

evaporator ofv this apparatus allows the 1 escape, under the form of steam evolved from the water from the pulp presses; the same quantity of steam at 2 kg. and this rating apparatus for the sweet juices of the mill instead of the live steam.

It is preferable not to subject the water from pulp presses to a temperature higher than 140 C., so as to avoid the formation of caramel and of nondigestible albumin.

The water from pulp presses will thus be concentrated up to 88 Baum for quantity of steam will be used in the evapoc obtaining a liquor containing all the substances contained in the initial waterv and it is this liquor which will, when mixed with chopped straw, oil-cakes or any other ligneous or woody substances, constitute a food of great value for cattle. This liquor may also, as above stated enter in the composition of manure. V

2nd 0ase.Rasping mill: The steam considered is that issuing from the steam engine of the rasping mill with the necessary addition of direct steam permitting to effect the heating of the. apparatus for extracting the beetroot juice. I 7

Usually the steam issues from the steam engine at 0 kg. 500 and this steam, to which is added or not live steam, is used for the heating of the difiusion battery.

In the process forming the subject matter of this invention, the steam is caused to issue from the steam engine at 3 kg. and this steam and the necessary direct steam are sent in an apparatus for the evaporation of water from pulp presses operating under pressure and with multiple effect. The last chest of evaporating apparatus will supplementary consumption of steam, since it is the same quantity of steam Which may be disposed of that is first used at a higher pressure for causing it to drop in a useful manner instead of causing it to expand without doing any Work.

I On the other hand it is also to be noted that the apparatus Works under pressure at a temperature higher than 105 C. This temperature is necessary for ensuring the conversion of the insoluble pectic substances into soluble metapectic substances, in order to avoid the fouling of the tubes of the evaporating apparatus. The albuminoid substances alone Will be coagulated by the heat, but they will remain digestible if they are not subjected to a temperature higher than 140 C.

Use must be made of an evaporating apparatus ensuring an intense circulation of the liquid.

Claim:

Process for the utilization of the residual Waters of the pressing of the pulp beetroot and of the residual Waters of the extraction 2 GASTQN ALBERT DURET. 

